Mold fob molding objects from



0. WALTER May 30, 1933.

MOLD F OR MOLDING OBJECTS FROM PLASTIC MATERIAL Filed May 18, 1931 3 Sheets-Sheet l I INVENTOR. 0220 mine ATTORNEY.

0. WALTER May 30, 1933.

MOLD FOR MOLDING OBJECTS FROM PLASTIC MATERIAL Filed May 18, 1931 3 Sheets-Sheet 2 INVENTOR. Ozfo iliier.

ATTORNEY.

May 30, 1933. o. WALTER 1,911,539

MOLD FOR MOLDING OBJECTS FROM PLASTIC MATERIAL Filed May 18. 1951 s Sheets-Sheet s INVENTOR.

Ofl'a Walter.

MMM, Q

ATTORNEY.

4 25 Tlieifull*nature of the V understood from the accompanying drawings Patented May 30, 1933 OTTO wnmnn wonrmitir sizitnn, INDIANA Application filed' May 18,

,This invention is a-m'old for molding objects iroiir plastic material and is fo'r improyeinents over that shown 111 myiformer appli'eation'for mold for molding objects 5 from-p1a'sticmateria1,*fi'led My 10, 1930, Serial Number 466,972 which has become 3011s feature of this invention consistsQin forinin'g two sides fof the mold plates of sheet meta-1 and the tWolateral edges of the mold plate having angle bar's spot-Welded er dthertyisesecured tothe two :side plates of the mold plate for spacing the mold plates apart in the mold h'oiz'arid reinforcing and Y greatly"strengthening said mold plates and particularly thetv'iolateraY edges'thereof; Anothenfeature of the invention consists in fdrmi ng each mom plate {relatively thin by-bringingthe sheet meeai'piates fol-111mg for most, or at least a large Part, Ofthe surface thereof. This is permitted te-{be dame by "reason of the "reinforcing angle fbar's atthe side-edges. 'Y

invention Will be and the following description: and claims. In the drawings, Fig. 1 isfa plan View of on 'form' of said improvedmold plate: Fig.

2' isa perspective of'one' sideofsaid mold plate; the same being centrallybroken away.

F ig; 3 is a horizontafsectio'n through' the mold-box immediately above themold plates with three mold plates therein and the box 3 5 partly broken away." Fig. 4 is aid-perspective View of a modified forln of said mold plate showing b'oth'sides plane and flat against eachhther, andbeing centrally broken-away. Figs. 5 6 and Taredrawingscorresponding e0 to Figs." 1,2 and'Ei" each showing a modified form ofmold plate; Fig z S is perspective View of the modified form of mold plate in Fig. '5 c'ntrally broken away; Figs- 9, 10 lT'aiyieivs similar-to Figs. 1, 2 and 3,,

but niodifi'edioriiifof moldplate.

Fig." '12 isaperspective View of another modified *form "of Fold plate"; centrally broken-away."

-'AsNeXpl-ajned in myformer application this invention contemplatesivthe lusefiof "a mold boX l5 4 in'which f mold plates, as here 1 shown, are *placed vertically adjacent each other and after the-*gmold plates have "been secured temporarily in the box, plasticr-zmate'fiial 16- is deposited: through? the opemtop of the b ox in-to the'spaces between saidemold plate's and thereby desired L'i-Objects ware formedia v 1.;3T1-1i i F3? ,1 E? 1" i r I "This molding apparatus Was designed .particularly for the purposeof making iIOOfiIlg shingles ont of clay- 'and the like," butthe i use 'of it is not limitedto roofing shinglespr to I plastic clfayas other articles may r bieimade and other plastic "materiallusedm F -Afitefi the shingles" For other objects have been -formed' orumolded said mold: and i have been dried and cured, the mold boxz is allowed to* set and the 'plastic' materialutherein to E dry' untii the tiles or other objects beingniold'e'd have becemecured; and then 10 the mold box is inverted: omai'tablei and: the mold platesandltiles readily removed and the mold plates again used ior similar .pur- Poses: The form of mold plate shown in Figs. 1, 2 and -B' consists of -a' sheet metal plate-12 0 forming'one"sideof the mold plate, and .a

sheet inet'al plate 21 formingthe other: side tliereofl-and saiid two plates are placed flat againstea h0t11er; as shown iin Figswl and I 2; and their'ends'secu'red'together by strong I 1 angle bars 22 that are'spot welded or otherwise secured "between said 'plates1'20 and 21 at'theirlaterahedges; V 5. J

l The aiigle b ars 22' are relatively thick and strong-' and; thereforef perform tWo ."important functions. One function is to serve as 5 uniform spacers ior spacing th'e mold plates 3 from each other, as 1 shown-tin sFig.

3. This enablesthemold plates to beilplaced readily into the mold box, one behind the other, without particular pains being to their location.

Another function of the angle bars 22 is that they serve togreatly strengthen and increase the durability of the mold plates in handling, in storage and in use. They stifi'- en the lateral edges of the mold plates and greatly strengthen them, as well as maintaining a uniform size for spacing purposes. By greatly strengthening the two lateral edges of the mold plates, as shown, the side plates and 21 may be relatively thin and do not need to be reinforced. Thus in Figs.

1 and 2 the side plate 20" is' fiat throughout excepting one lateral edge, and in the modified form shown in Fig. 4 both plates 20 and 21 are alike fiat throughout excepting one lateral edge. In the form shown in Figs. 1 and 2, the plate 21 is reinforcedby the stamped extensions. 23, as shown. These stamped extensions have two functions, one of which is to strengthen the plate 21 and another function is to diminish the weight of the shingle or other article 16 that is molded thereby. As seen in Fig. 3, it is noted that each shingle has two thm portions.

s 1 Each plate 20 and 21 has onelateral edge formed with a vertical extension25 and a depression 26 adjacent the anglevbar 22. This is to provide the roofing shingle with a groove 27 and a rib at 28 extending longitudinally thereof, whereby the shingles may overlap and interlock with each other when secured on the roof or other place foriuse.

In the form of mold plate shown in Fig. 1, these two peculiarly formed: side portions extend in opposite directions and likewise the angle bars 22 extend. in opposite directions. r In the modified form in Fig. 4,'the'two plates 20 and 21 are identical excepting that they are. reversed when associated together informing a mold plate. They make a thick, heavy and strong roofing shingle or the like, as shown in Fig. 3. V

The modified form of mold plate shown in Figs. 5, 6,7 and 8 differs from that shown in Figs. 1, 2 and 3 in the form of the side plates 20 and 21 and position of the angle bars 22. The; side plate 20 has below its top on one side an extension 120 and near the. top and bottom on the opposite side two. extensions 22 and ,a rib forming extension 125 near one end. Theside' plate 21 has two extensions 121 from top to bottom. The extensions 220 and 121 in the two plates are adapted to interfit asshown in Fig. 5. This arrangement of thesideplates makes a very strong mold plate.

In Fig.5 the construct on of the left hand end agrees with the-construction of the left hand end in Fig. 1, asto the angle bars 22, excepting that the parts are ref'verse d inposition, the angle bars extendgiven ing rearward in Fig. 1 and forward in Fig.

5. At the right hand end in Fig. 5 the angle bar is in the same position as the right hand end of Fig. 1, but the rib forming member is on the plate 20 instead of on the plate 21, as in Fig. 1 that is reversed.

In the assembled form of mold shown in Fig. 7, the first mold plate consists only'of the plate 20, as shown in Fig. 5, but with the angle bar 22 associated therewith as spacers, b ut the remaining mold plates in Fig. "7 w are the same as shown in Figs. 5 and 6.

In the modified form shown in Figs. 9 to 12 the plate 20 hasa curved portion and a straight portion as shown in Fig. 9, with an inwardly extending portion 320 at both the top and'bottom, as seen in Fig. 12.

The plate 21 .is provided likewise with a curvedaportion and a straight portion substantially paralleling said portions in side plate 20.v The angle bars 22 are reversely arranged with reference to each other the same as in Fig. 1.

The interlocking rib in the shingle or object to be'formed is formed by the ribf30, as seen in Figs. 11 and 12, but these ,ribs

do not extend for. the full vertical. dimensions of the mold plate, as they are located only at the top and bottom,as seen in Fig.

I claim as my invention:

1. In a mold for. molding'objects from plastic material, a two-faced mold plate formed oftwo sheet metal plates adjacent each other, and angle bars betweenand secured to the lateral edges of said plates for securing them together in a unitary mold plate. g j p I j .2. In a mold for molding objects from plastic material, a two-faced mold plate formed of two sheet metal plates adjacent each other, and L -shaped angle bars between .and securedtothe lateral edge of said plates for securing them together in a unitary mold plate. i 3. In a mold for molding objects from plastic material, a two-faced mold plate ing L-shaped angle bars secured to and between the lateral edges of said side plates.

5. A mold plate formed of two sheet metal plates with their sides secured together, each sheet being fiat excepting that it has at one edge a rib-forming portion and said rib portions on the two metal plates being in reverse positions, and reversely extending L- shaped angle bars secured to and between the lateral edges of said side plates.

In witness whereof, I have hereunto affixed my signature.

OTTO WALTER. 

